This is a note to let you know that I've just added the patch titled
iio: adc: ad7949: fix wrong ADC result due to incorrect bit mask
to my staging git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git in the staging-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From f890987fac8153227258121740a9609668c427f3 Mon Sep 17 00:00:00 2001
From: Wilfried Wessner wilfried.wessner@gmail.com Date: Mon, 8 Feb 2021 15:27:05 +0100 Subject: iio: adc: ad7949: fix wrong ADC result due to incorrect bit mask
Fixes a wrong bit mask used for the ADC's result, which was caused by an improper usage of the GENMASK() macro. The bits higher than ADC's resolution are undefined and if not masked out correctly, a wrong result can be given. The GENMASK() macro indexing is zero based, so the mask has to go from [resolution - 1 , 0].
Fixes: 7f40e0614317f ("iio:adc:ad7949: Add AD7949 ADC driver family") Signed-off-by: Wilfried Wessner wilfried.wessner@gmail.com Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Reviewed-by: Charles-Antoine Couret charles-antoine.couret@essensium.com Cc: Stable@vger.kernel.org Link: https://lore.kernel.org/r/20210208142705.GA51260@ubuntu Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com --- drivers/iio/adc/ad7949.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/adc/ad7949.c b/drivers/iio/adc/ad7949.c index 5d597e5050f6..1b4b3203e428 100644 --- a/drivers/iio/adc/ad7949.c +++ b/drivers/iio/adc/ad7949.c @@ -91,7 +91,7 @@ static int ad7949_spi_read_channel(struct ad7949_adc_chip *ad7949_adc, int *val, int ret; int i; int bits_per_word = ad7949_adc->resolution; - int mask = GENMASK(ad7949_adc->resolution, 0); + int mask = GENMASK(ad7949_adc->resolution - 1, 0); struct spi_message msg; struct spi_transfer tx[] = { {